I really like Shuttle, it has a beautiful and clean interface. I can't comment on the EQ quality because I keep it flat and I also can't tell the difference in sound quality between Neutron, Poweramp, Winamp, Samsung, and Jetaudio.

I got poweramp full edition for $1.50 or something like that 2 years ago I think it was.
Been using it since. For some reason some of my songs synced twice so I have lots of double but it also has a feature to remove doubles. I find the UI very nice. Enjoying it on my nexus 5

I got poweramp full edition for $1.50 or something like that 2 years ago I think it was.
Been using it since. For some reason some of my songs synced twice so I have lots of double but it also has a feature to remove doubles. I find the UI very nice. Enjoying it on my nexus 5

Go into settings, and be sure you have the right folders selected. I use to get doubles all the time until I deselected either the legacy or emulated folder.